JP5955874B2 - Carrier and carrier manufacturing method - Google Patents

Description

  The present invention relates to a carrier for a planetary gear mechanism and a method for producing the carrier.

The planetary gear mechanism has a basic configuration in which a plurality of pinion gears are disposed between a sun gear and a ring gear surrounding the outer periphery of the sun gear.
Each of the pinion gears is rotatably supported by a common carrier. In this state, each pinion gear meshes with a sun gear located on the inner diameter side and a ring gear located on the outer diameter side.

  Patent Document 1 discloses a method of producing a support portion of a pinion gear in a carrier by pressing, and a single carrier having a pinion gear support portion provided inside a bottomed cylindrical carrier base portion is disclosed. It is disclosed that it produces from the blank board of this.

JP 2012-107712 A

In the method disclosed in Patent Document 1, since the support portion of the pinion gear is also formed by drawing in addition to the bottomed cylindrical carrier base portion, the number of drawing operations to be performed until the carrier forming is completed. More than the case where only the carrier base portion is formed by drawing.
Here, the blank plate to be prepared first when the carrier is molded needs to be large in consideration of the area used for drawing, so the larger the number of drawing operations, the larger the blank plate is prepared. There is a need to.

  However, when the area of the blank plate for drawing is increased, wrinkles are likely to occur during drawing. Therefore, when the carrier is molded by the method of Patent Document 1, there is a tendency that many wrinkled molded products are obtained, and as a result, the yield of the carrier that is the molded product is deteriorated.

  Therefore, it is required to improve the yield of carriers molded by pressing.

The present invention
A carrier production method for producing a carrier in which a pinion gear support portion is provided on a bottomed cylindrical carrier base portion from a single blank plate,
In the disk-shaped workpiece obtained by punching out the blank plate, the cylindrical wall surrounding the expanded through-hole while expanding the through-hole formed in the region to be the support portion by burring, Projecting and forming on one side of the workpiece;
Forming a penetrating portion penetrating the workpiece in the thickness direction along the outer periphery of the cylindrical wall while leaving a connection portion with the workpiece in one place in the circumferential direction of the cylindrical wall;
Forming a support portion for the pinion gear by starting the connecting portion between the cylindrical wall and the workpiece as a starting point and causing the cylindrical wall to move to the other side of the workpiece. .

According to the present invention, since the pinion gear support portion is formed without performing the drawing process, the number of drawing processes performed when manufacturing the carrier is set to 1 when the bottomed cylindrical carrier base portion is molded. Therefore, since the size of the blank plate to be prepared first is reduced by the amount of drawing, the generation of wrinkles during the production of the carrier is suppressed, and the carrier is removed. The yield at the time of manufacturing will be improved.

It is a perspective view of the carrier concerning an embodiment. It is a figure explaining the carrier concerning an embodiment. It is a flowchart of the manufacturing method of the carrier concerning embodiment. It is a figure explaining the preparation methods of the carrier concerning an embodiment. It is a figure explaining the preparation methods of the carrier concerning an embodiment. It is a figure explaining the preparation methods of the carrier concerning an embodiment. It is a figure explaining the preparation methods of the carrier concerning an embodiment. It is a figure explaining the preparation methods of the carrier concerning an embodiment. It is a figure explaining the preparation methods of the carrier concerning an embodiment.

Hereinafter, the carrier 1 according to the embodiment of the present invention will be described.
FIG. 1 is a perspective view of a carrier 1 manufactured by the carrier manufacturing method according to the embodiment. 2A and 2B are diagrams for explaining the carrier 1, wherein FIG. 2A is a plan view, FIG. 2B is a cross-sectional view of the carrier 1 taken along the line AA in FIG. () Is sectional drawing which cut | disconnected the carrier 1 along the BB line in (a).

  In the automatic transmission, the carrier 1 is provided coaxially with the rotation shaft (axis line X) of the sun gear (not shown) of the planetary gear mechanism. In this carrier 1, the carrier 1 is disposed inside the bottomed cylindrical carrier base portion 2. A support portion 5 for a pinion gear (not shown) is provided.

The carrier base 2 has a base 3 that forms a ring shape when viewed from the axial direction of the axis X, and a peripheral wall 4 that surrounds the periphery of the base 3 over the entire circumference.
A spline groove 41 extending in the axial direction of the axis X is provided in the upper part of the peripheral wall 4 over the entire circumference in the circumferential direction around the axis X. The upper side of the peripheral wall 4 is a clutch plate (not shown). The clutch hub 42 is engaged.

In the center of the base 3, an opening 31 through which a rotation shaft (not shown) of the sun gear is inserted is formed through the base 3 in the thickness direction, and a processing hole 6 is formed radially outside the opening 31. Has been.
The processing holes 6 are also formed through the base 3 in the thickness direction, and three processing holes 6 are provided at equal intervals in the circumferential direction around the axis X.

  As shown in FIG. 2, the side edge 6a on the inner diameter side of the processing hole 6 in a plan view is formed in a straight line along a straight line Lm orthogonal to the diameter line Ln of the base 3, and the side edge 6a The cylindrical support 5 is connected.

As shown in FIGS. 2B and 2C, the support portion 5 includes support wall portions 51 and 52 that support the rotation shaft of the pinion gear, and side walls that connect the end portions of the support wall portions 51 and 52 to each other. Parts 53 and 54.
The support wall portions 51 and 52 are provided in parallel to each other at positions symmetrical with respect to the straight line Y extending in parallel to the base portion 3.
The support walls 51 and 52 are formed with support holes 51a and 52a that support the rotation shaft of the pinion gear in the thickness direction, and the support holes 51a and 52a are parallel to the axis X. It is formed coaxially on the axis X1.

  For this reason, when the rotation shaft of the pinion gear is supported by the support holes 51a and 52a, the pinion gear is provided in a state in which it can rotate about the axis X1 parallel to the rotation axis (axis X) of the carrier 1. ing.

  The side wall portions 53 and 54 that connect the end portions of the support wall portions 51 and 52 are provided symmetrically with respect to the support wall portions 51 and 52 at positions symmetrical with respect to the axis X1. The connecting portion between the side wall portions 53 and 54 and the support wall portions 51 and 52 is subjected to curved surface processing.

A space inside the support portion 5 surrounded by the support wall portions 51 and 52 and the side wall portions 53 and 54 serves as a storage portion 55 that stores the pinion gear.
Each of the support portions 5 has a side wall portion 52 connected to the side edge 6 a of the processing hole 6, and each of the support portions 5 is cantilevered by the side edge 6 a of the processing hole 6. They are provided in parallel to each other (see FIG. 2B).
Further, in this state, the support portion 5 has the accommodating portion 55 along a straight line Y orthogonal to the axis line X as seen from the radial direction of the axis line X (see FIG. 2B). When viewed from the direction, the pinion gear accommodating portion 55 in the support portion 5 is disposed with the opening directed in the radial direction of the axis X (the axial direction of the diameter line Ln).

Hereinafter, production of the carrier 1 from one blank plate will be described.
FIG. 3 is a flowchart of the manufacturing process of the carrier 1.
4A and 4B are views for explaining a workpiece 100A produced by a punching process, where FIG. 4A is a perspective view, and FIG. 4B is a plan view of the base 101 taken along plane A in FIG. .
FIGS. 5A and 5B are diagrams for explaining the workpiece 100B obtained by the burring process, in which the cylindrical wall 104 is formed. FIG. 5A is a perspective view, and FIG. 5B is a diagram illustrating the workpiece 100B. It is sectional drawing which cut | disconnected the base 101 in the surface A in FIG.
FIGS. 6A and 6B are diagrams illustrating the workpiece 100C obtained by the perforating process, in which the support 100 is formed, FIG. 6A is a perspective view, and FIG. 6B is a diagram illustrating the workpiece 100C. It is sectional drawing which cut | disconnected the base 101 in the surface A in (c), and is the BB arrow line view in (b).
FIGS. 7A and 7B are diagrams for explaining the workpiece 100D obtained by the raising process, in which the support portion 5 is caused, FIG. 7A is a perspective view, and FIG. 7B is a diagram in FIG. FIG. 6 is a cross-sectional view of a base 101 taken along a plane A.
FIG. 8 is a perspective view of the workpiece 100E obtained by the drawing step, and FIG. 9 is a perspective view of the workpiece 100F obtained by the ironing step.

First, a workpiece 100A (punched plate) in which a circular opening 31 and a rectangular shaped lower hole 102 are formed in a disc-shaped base 101 is produced by stamping a blank plate by pressing (step S101). : Punching process).
The opening 31 is a through-hole through which the rotation shaft of the sun gear is inserted in the carrier 1 that is finally produced, and is formed at the center of the base 101 that forms a circle when viewed from the axial direction of the central axis (axis X) of the workpiece 100A. Is formed.
The lower hole 102 is a through hole formed in a region that becomes the support portion 5 of the carrier 1 to be finally produced.
Here, three lower holes 102 are formed at equal intervals in the circumferential direction around the opening 31, and are formed in the same number as the number of support portions 5 included in the carrier 1. The separation distance r from the center of the base 101 (center P of the opening 31) to the center P1 in the radial direction of the lower hole 102 is the same for all the lower holes 102.

Subsequently, the workpiece 100B in which the diameter-lowered lower hole 103 and the cylindrical wall 104 surrounding the lower hole 103 are formed in the base 101 is manufactured by burring processing on the workpiece 100A (step S102: burring process).
In this burring process, while pushing down the lower hole 102 of the base 101, the peripheral edge of the lower hole 102 is moved to one side in the thickness direction of the base 101 to surround the expanded lower hole 103. A wall 104 is formed.

Here, the enlarged lower hole 103 is formed with a radially inner diameter W1 and a widthwise inner diameter W2 that are aligned with the accommodating portion 55 of the support portion 5 finally obtained ((c) in FIG. 2). See), and the cross-sectional shape of the enlarged lower hole 103 and the cross-sectional shape of the accommodating portion 55 are the same.
Further, the length L1 (see FIG. 5B) from the upper surface 101a of the base 101 of the cylindrical wall 104 in the axis X direction is the radial length L1 of the axis X of the support portion 5 finally obtained. They match (see (b) of FIG. 2).

  Subsequently, the workpiece 100C in which the support portion 5 of the pinion gear is formed on the base portion 101 in the direction along the axis X is produced by drilling the workpiece 100B (step S103: drilling step).

As shown in FIG. 6 (c), in this drilling process, a part of the area of the base 101 surrounding the cylindrical wall 104 of the workpiece 100B is left leaving a partial area on the opening 31 side (axis X side). By forming the groove 7, the pinion gear support portion 5 is formed in a state where one side of the inner diameter side thereof is connected to the base portion 101.
In the workpiece 100 </ b> C, the through groove 7 is formed along the outer periphery of the support portion 5, and the through groove 7 has a C shape when viewed from the axial direction of the axis X.

  In the portion of the through groove 7 that wraps around the inner diameter side of the support portion 5, the width W 3 of the through groove 7 in the direction of the diameter line Ln becomes narrower as it approaches the diameter line Ln. The edge 7 a is formed in parallel to the side edge on the inner diameter side of the support portion 5 along a straight line Lm orthogonal to the diameter line Ln of the base portion 101.

Furthermore, the side edges 7b and 7c of the through groove 7 extend in parallel to the diameter line Ln at positions symmetrical with respect to the diameter line Ln, and the side edge 7d on the outer diameter side of the through groove 7 is It forms an arc shape along the inner periphery of the peripheral wall 4 of the carrier 1 that is finally formed.
Here, the width W5 of the gap between the side edge 7d of the through groove 7 and the outer periphery of the support portion 5 is larger than the width W4 of the gap between the side edges 7b, 7c and the support portion 5, and this hole In the triggering process following the emptying process, a width that can avoid the interference between the support portion 5 and the side edge 7d of the through groove 7 is secured.

In the raising process, the support part 5 formed in the direction along the axial direction of the axis X in the workpiece 100C is raised above the base part 101, and the support part 5 of the pinion gear is arranged in a direction parallel to the base part 101. The finished workpiece 100D is produced (step S104: triggering step).
In this inducing step, the support portion 5 is bent along the side edge 52 a (straight line La) on the inner diameter side of the support wall portion 52 located on the connection portion 8 side of the support portion 5, and the support portion 5 is By causing upward, the support portion 5 is formed in which the accommodating portion 55 inside the support portion 5 is opened in a direction along the diameter line Ln of the base portion 101 when viewed from the axial direction of the axis X.
At this time, the through groove 7 surrounding the raised support portion 5 becomes the processed hole 6.

And the workpiece | work 100E provided with the bottomed cylindrical carrier base part 2 is produced by the squeezing process with respect to the base 101 of the workpiece | work 100D (step S105: squeezing process).
In this squeezing step, an area that becomes the base 3 in the base 101 is pushed by an annular punch (not shown) and pushed into a cylindrical lower mold (not shown), so that the outer peripheral portion of the base 101 is The bottomed cylindrical carrier base portion 2 is formed by being narrowed down so that the outer periphery of the base portion 3 is surrounded by the peripheral wall portion 4 over the entire circumference.

Subsequently, the workpiece 100F in which the clutch hub 42 is formed on the upper side of the peripheral wall portion 4 is produced by an ironing step on the workpiece 100E (step S106: ironing step).
In this ironing step, a spline groove 41 extending in the vertical direction along the axis X is formed on the upper side of the peripheral wall portion 4 by reducing the thickness of the upper portion of the peripheral wall portion 4. At this time, the clutch hub 42 is formed by forming the spline groove 41 over the entire circumference in the circumferential direction around the axis X on the upper side of the peripheral wall portion 4.

  Finally, a carrier 1 (see FIG. 1) in which support holes 51a and 52a for supporting the rotation shaft of the pinion gear are formed in the support wall portions 51 and 52 of the support portion 5 is manufactured by the hole machining step for the workpiece 100F (see FIG. 1). Step S107: drilling step).

As described above, in the method for manufacturing the carrier 1 according to the embodiment, the pinion gear support 5 is formed without performing the drawing process. Therefore, the number of drawing processes performed when the carrier 1 is manufactured can be reduced. Only once to form the cylindrical carrier base portion 2.
Therefore, when the carrier 1 is manufactured, the size of the blank plate to be prepared first can be further reduced, so that generation of wrinkles during the manufacturing of the carrier 1 can be suppressed.

As described above, in the embodiment,
(1) A carrier manufacturing method for manufacturing a carrier 1 in which a pinion gear support portion 5 of a planetary gear mechanism is provided on a bottomed cylindrical carrier base portion 2 from a single blank plate,
In the disc-shaped workpiece 100A obtained by punching the blank plate, the diameter of the lower hole 103 (expanded) is increased while the diameter of the lower hole 102 (through hole) formed in the region to be the support portion 5 is increased by burring. A step (step S102: burring step) of forming the cylindrical wall 104 surrounding the through-hole (diametered through-hole) so as to protrude from the base 101 of the workpiece 100A to one side;
A through groove 7 (penetrating portion) penetrating the base portion 101 in the thickness direction is formed along the outer periphery of the cylindrical wall 104 while leaving the connecting portion 8 with the base portion 101 at one place in the circumferential direction of the cylindrical wall 104. Steps,
A step of forming the pinion gear support 5 by causing the cylindrical wall 104 to move to the other side of the base 101 starting from the connecting portion 8 between the cylindrical wall 104 and the base 101, and did.

If comprised in this way, since the support part 5 of a pinion gear is formed, without performing a drawing process, the bottomed cylindrical carrier base part 2 is shape | molded by the frequency | count of the drawing process performed when producing the carrier 1. It can be done once.
Therefore, since the size of the blank plate to be prepared first is reduced by the amount of reduction in the number of drawing processes, the generation of wrinkles during the production of the carrier 1 is suppressed, and the yield in producing the carrier is reduced. Will improve.

(2) A plurality of pinion gear support portions 5 are provided at predetermined intervals in the circumferential direction around the central axis (axis X) of the disk-shaped base portion 101.
In the step of forming the through-groove 7, the through-groove 7 is formed on the axial line X side of the cylindrical wall 104 when viewed from the axial direction of the axial line X, leaving the connecting portion 8.

  If comprised in this way, length La (refer FIG.7 (b) of FIG. 7) of the diameter line Ln direction of the base 101 located between the cylindrical wall 104 and the opening 31 located in the inner diameter side of this cylindrical wall 104 ) Can be ensured, and a decrease in the rigidity strength of the base 101 can be suitably prevented.

(3) When viewed from the axial direction of the axis X (center axis), the cylindrical wall 104 has a pair of support wall portions 51 and 52 (parallel to the diameter line Ln of the disc-shaped base 101 and provided in parallel to each other). Wall portion) and a pair of side wall portions 53 and 54 (connection wall portions) for connecting ends of the pair of support wall portions 51 and 52, and the connection portion 8 is a pair of support wall portions. Among 51 and 52, it was set as the structure left on the axis line X side of the support wall part 52 located in an inner diameter side.

  If comprised in this way, since length La of the diameter line Ln direction of the base 101 located between the support wall part 52 and the opening 31 located in the inner diameter side of this support wall part 52 is securable, A decrease in the rigidity strength can be suitably prevented.

(4) In the step of forming the through groove 7, the through groove 7 is formed from both side portions in the longitudinal direction of the support wall portion 52 to the vicinity of the diameter line Ln passing through the center in the longitudinal direction of the support wall portion 52. The configuration.

  With this configuration, when the through-groove 7 formed in the vicinity of the diameter line Ln causes the support portion 5 in the triggering process, the connection portion 8 that connects the support portion 5 and the base portion 101 and the side wall Since the deformation of the portions 53 and 54 is avoided, the support portion 5 can be easily raised.

Furthermore, in the embodiment,
(5) A carrier in which a plurality of pinion gear support portions 5 are provided at predetermined intervals in the circumferential direction around the central axis (axis X) of the base portion 3 on the base portion 3 (bottom plate portion) of the bottomed cylindrical carrier base portion 2. 1 and
Each of the support portions 5 is formed in a cylindrical shape that can accommodate the pinion gear,
One end portion 52b in the longitudinal direction of the support portion 5 formed in a cylindrical shape is connected to a side edge 6a of a processing hole 6 (through hole) penetrating the base portion 3 in the thickness direction, and the support portion 5 is connected to the processing hole 6 side. While being cantilevered at the edge 6a,
The carrier 1 having a configuration in which the support portion 5 is arranged in parallel to the base portion 3 with the opening of the support portion 5 formed in a cylindrical shape along the diameter line Ln of the base portion 3 viewed from the axial direction of the axis X. age,
The support portion 5 includes a connecting portion 8 connected to the base portion 101 provided at one place in the circumferential direction of the cylindrical wall 104 with the cylindrical wall 104 formed by protruding from the base portion 101 (bottom plate portion) in the axis X direction. It was set as the structure which was formed by starting as a starting point.

When the carrier 1 having such a configuration is used, the pinion gear support portion 5 is formed without drawing, so the number of drawing operations performed when the carrier 1 is manufactured is the bottomed cylindrical carrier base portion. 2 can be made once.
Therefore, since the size of the blank plate to be prepared first is reduced by the amount of reduction in the number of drawing processes, the generation of wrinkles during the production of the carrier 1 is suppressed, and the yield in producing the carrier is reduced. Will improve.

  In the above-described embodiment, the connection portion 8 is the inner diameter side (axis X side) of the support wall portion 52 located on the inner diameter side when viewed from the axial direction of the axis X of the pair of support wall portions 51 and 52. However, it may be left on the outer diameter side (the side opposite to the axis X) of the support wall portion 51 located on the outer diameter side.

Also by doing this, the pinion gear support 5 is formed without drawing, so that the number of drawing operations performed when the carrier 1 is manufactured can be suppressed.
Therefore, since the size of the blank plate to be prepared first is reduced by the number of times of drawing, the generation of wrinkles during the production of the carrier 1 is suppressed, and the yield when producing the carrier is reduced. Will improve.

DESCRIPTION OF SYMBOLS 1 Carrier 2 Carrier base part 3 Base part 4 Perimeter wall part 5 Support part 6 Process hole 6a-6d Side edge 7 Through groove 7a-7d Side edge 8 Connection part 31 Opening 41 Spline groove 42 Clutch hub 51, 52 Support wall part 51a, 52a Support hole 53 Side wall part 55 Housing part 100A to 100F Workpiece 101 Base part 102 Lower hole 103 Expanded lower hole 104 Cylindrical wall Ln Diameter line Lm Straight line X Axis line (center line)

Claims (7)

A carrier production method for producing a carrier in which a pinion gear support portion is provided on a bottomed cylindrical carrier base portion from a single blank plate,
In the disk-shaped workpiece obtained by punching out the blank plate, the cylindrical wall surrounding the expanded through-hole while expanding the through-hole formed in the region to be the support portion by burring, Projecting and forming on one side of the workpiece;
Forming a penetrating portion penetrating the workpiece in the thickness direction along the outer periphery of the cylindrical wall while leaving a connection portion with the workpiece in one place in the circumferential direction of the cylindrical wall;
Forming a support portion for the pinion gear by starting the connecting portion between the cylindrical wall and the workpiece as a starting point and causing the cylindrical wall to move to the other side of the workpiece. Method. A plurality of the support portions are provided at predetermined intervals in the circumferential direction around the central axis of the disk-shaped workpiece,
2. The step of forming the penetrating portion includes forming the penetrating portion on the central axis side of the cylindrical wall when viewed from the axial direction of the central axis, leaving the connection portion. Method for producing the carrier. The cylindrical wall as viewed from the axial direction of the central axis,
A pair of walls provided in parallel to each other perpendicular to the diameter line of the disk-shaped workpiece;
A pair of connecting wall portions that connect the ends of the pair of wall portions,
The method for manufacturing a carrier according to claim 2, wherein the connecting portion is left on the central axis side of a wall portion located on the central axis side of the pair of wall portions.   The step of forming the penetrating portion includes forming the penetrating portion from both side portions of the wall portion on the central axis side to the vicinity of the central portion in the longitudinal direction of the wall portion. A method for producing the carrier according to 1. A plurality of the support portions are provided at predetermined intervals in the circumferential direction around the central axis of the disk-shaped workpiece,
The step of forming the penetrating part includes forming the penetrating part on the opposite side of the cylindrical wall from the central axis when viewed from the axial direction of the central axis, leaving the connecting part. Item 2. A method for producing a carrier according to Item 1. A carrier having a plurality of pinion gear support portions provided on the bottom plate portion of the bottomed cylindrical carrier base portion,
Each of the support portions is formed in a cylindrical shape capable of accommodating the pinion gear,
While supporting one end of the cylindrically formed support portion in the longitudinal direction with a side edge of a through hole penetrating the bottom plate portion in the thickness direction,
The support portion is arranged in parallel with the bottom plate portion in an orientation along the diameter line of the bottom plate portion as viewed from the central axis direction, with the opening of the support portion formed in the cylindrical shape. To career.   The support portion causes a cylindrical wall formed by projecting from the bottom plate portion in the central axis direction, starting from a connection portion with the bottom plate portion provided at one place in the circumferential direction of the cylindrical wall. The carrier according to claim 6, wherein the carrier is formed.

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